DEVELOPMENT OF PROTECTION ALGORITHM FOR INTEGRATED MICROGRID SYSTEMS

Abstract

With increasing research in the power system to reduce losses and improve reliability, DC Microgrid has come into the era of experimentation. And the presence of solar, fuel cell, battery-like distribution energy resources, and ever-increasing DC load make DC Microgrid more popular day by day. Moreover, to supply a small area where conventional energy sources cannot provide electricity economically, DC Microgrid is gaining more popularity there. Due to fewer conversion stages in DC Microgrid, as compared to AC Microgrid, conversion losses and ohmic losses reduce and effectively, overall system efficiency increases. Also, the bidirectional converter directly connects the energy storage component to the DC bus, which helps to increase the overall reliability of the Microgrid. However, the addition of renewable and a variety of control operations in DC Microgrid introduces new challenges in protection. Lake of proper standards and guidelines for the DC grid makes it more complex for control and protection. A novel protection method has been designed for the protection of the system against faults and the isolation of problematic pieces. Because all approaches have advantages and limitations, we must optimise a system that works in all DC microgrid situations (for example, high resistance fault and grid-connected mode). The presence of distribution generations (DGs) in a DC Microgrid enables bidirectional current flow, which cannot be detected by an overcurrent relay in a traditional AC system. Furthermore, because available fault detection methods are dependent on DC fault resistance, large resistance faults cause system failure. In this report, we have used The time-domain differential average energy of each phase's current signal can be utilized to classify and estimate the location of faults in the DC Microgrid The results confirm that the proposed protection scheme is accurate and capable of classifying and locating faults in the DC microgrid.